问题描述
我做 cmake .&&全部安装.这有效，但安装到 /usr/local.
I do cmake . && make all install. This works, but installs to /usr/local.
我需要安装到不同的前缀(例如，安装到 /usr).
I need to install to a different prefix (for example, to /usr).
要安装到 /usr 而不是 /usr/local 的 cmake 和 make 命令行是什么?
What is the cmake and make command line to install to /usr instead of /usr/local?
推荐答案
您可以在命令行中传入任何 CMake 变量，或使用 ccmake/cmake-gui 编辑缓存的变量.在命令行中，
You can pass in any CMake variable on the command line, or edit cached variables using ccmake/cmake-gui. On the command line,
cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr . && make all install将配置项目，构建所有目标并安装到/usr 前缀.类型 (PATH) 不是绝对必要的，但会导致基于 Qt 的 cmake-gui 显示目录选择器对话框.
Would configure the project, build all targets and install to the /usr prefix. The type (PATH) is not strictly necessary, but would cause the Qt based cmake-gui to present the directory chooser dialog.
作为评论的一些小补充清楚地表明，对某些人来说，提供简单的等效是不够的.最佳实践是使用外部构建目录，即不直接使用源代码.还要使用更通用的 CMake 语法来抽象生成器.
mkdir build && cd build && cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr .. && cmake --build . --target install --config Release您可以看到它变得更长了，并且不再直接等效，而是以相当简洁的形式更接近最佳实践...... --config 仅用于多配置生成器(即 MSVC)，被其他人忽略.
You can see it gets quite a bit longer, and isn't directly equivalent anymore, but is closer to best practices in a fairly concise form... The --config is only used by multi-configuration generators (i.e. MSVC), ignored by others.
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